FLC OF AN LTT LANDED AND TOOK OFF ON A RWY OF INSUFFICIENT LEGAL LENGTH.

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WE TOOK OFF FROM DTW AT XA15Z WITH A WX PACKAGE AND RELEASE WITH NO INDICATION OF ANY NOTAM DISPLACING THE THRESHOLD OF RWY 15 AT YXU. ARRIVING AT YXU; ATIS WAS UNAVAILABLE. WE RECEIVED WX FROM APCH; AND WE WERE CLRED TO LAND RWY 33. TAXIING OUT FOR TKOF WE RECEIVED THE NOTAM FOR RWY 15; DISPLACING THE THRESHOLD ABOUT 1500 FT. THERE WAS STILL OVER 6000 FT OF USABLE RWY; SO WE DECIDED TO USE RWY 33 FOR TKOF. LATER ON IN THE DAY AFTER 3 OF OUR COMPANY'S ACFT DOING THE SAME THING; THE 4TH THOUGHT ABOUT RWY ANALYSIS AND REFUSED TO LAND ON IT. AFTER CHKING WITH DISPATCH THEY AGREED WITH HIM AND HAD ANOTHER RWY OPENED FOR HIM. ME; BEING NEW WITH THE COMPANY AND ON LINE FOR LESS THAN 3 WKS; PAIRED WITH A NEW CAPT WHO UPGRADED IN MY CLASS AND ON HIGH MINIMUMS; TOOK OFF ON RWY 33 WITHOUT RWY ANALYSIS FOR THE NOTAMED SHORTER RWY. WE DISCOVERED THIS LATER THAT DAY WHEN THE LAST ACFT REFUSED TO LAND ON THAT RWY AND TOLD US ABOUT IT. WE HAD NO INDICATION GOING UP THERE ON OUR WX DISPATCH RELEASE. ATIS WAS BEING CHANGED SO WE RECEIVED WX FROM APCH CTL. ON GETTING THE ATIS BEFORE TAXIING FOR TKOF WE BECAME AWARE OF THE NOTAM. I NEVER EVEN CORRELATED THE CLOSING OF 1500 FT WITH THE REQUIREMENT OF NEW RWY ANALYSIS. WE TOOK OFF KNOWING THAT 6000 FT WOULD BE GOOD. I WILL NOW LOOK AT WX PACKAGES CLOSER AND ASK ABOUT LCL NOTAMS BEFORE LNDG OR TAKING OFF AND CORRELATING THEM WITH RWY ANALYSIS.